Ludlum Measurements 195271, Manual

Page: 16 / 45

MODEL 2000 Technical Manual
Section 4
Ludlum Measurements, Inc. Page 4-2 November 2020
Back Panel
RS-232 connector
: a 9 pin “D” connector, allowing output to a
computer or optional printer
RS-232 Data Dipswitch
: two-pole dipswitch located on the rear chassis
underneath the calibration cover; controls the RS-232 data
The top switch (
PC
/
PRNTR
) controls the type of data. In
PC
mode, data
is bi-directional, allowing the computer to start/stop counting. If the
dipswitch is set to
PC
, and the push-wheels are all set to zero, the
instrument count time can be changed by the computer through the RS-
232 port. In the
PRNTR
mode, the scaler count is output only at the end
of each count. If the dipswitch is set to
PRNTR
, setting the push-wheels
to “000” sets the count time to infinity, allowing for very long count
times.
The bottom dipswitch (
RECYCLE OFF
) allows counting to recycle instead
of requiring a manual count for each cycle.
Input Power
: a receptacle for 95-250 Vac, 50-60 Hz line cord
Battery compartment
: holds four “D” cell batteries
Internal Controls
Time-base Dipswitch
: two-pole dipswitch located on the main circuit
board. This switch allows for selection of a seconds time base, variable from
0 to 999 seconds, with a multiplier switch of ×1 and ×10. Setting all push-
wheels to zero allows the instrument count time to be set by an external
computer through the RS-232 port if the RS-232 back-panel dipswitch is
set to
PC
. If the RS-232 dipswitch is set to
PRNTR
, setting the push-wheels
to “000” sets the count time to infinity, allowing for very long count times.